OPC Quick Client
After you connected to a device, you can access the OPC Quick Client in the Gateway. It allows for quick, simple testing of any devices connected to the server.
You can find the Quick Client under the OPC Connections section of the Ignition Gateway Config section. You can browse by expanding the tree nodes and read from or write to Tags by clicking on the [r] and [w] buttons next to those tags.
Subscriptions can be made by clicking on the [s] button. Clicking on the enable live values link will automatically refresh subscriptions and show live value changes (if there are any).